The dream
I was flying over mountains and rivers
Interpretation
Flying above mountains and rivers puts you far from the things that usually fill your view. From up there, steep ground and winding water become parts of one wide landscape. That can fit a time when you are trying to see your life as a whole. The mountains may be hard things you can look at without being stuck among them. The rivers add movement, as if feelings or plans are still making their way forward. You did not mention fear or a destination, so the flight feels more like a change in perspective than an escape. For a while, you could move freely above both the high places and the flowing water.
Psychological view
Dreams often combine familiar places and actions without following waking rules. Flying can draw on the brain’s sense of movement during sleep, while the mountains and rivers give that movement a setting. Psychologically, seeing large features from above may fit a wish for more room around whatever feels complicated in waking life. The dream does not say whether you felt calm or frightened, so neither freedom nor anxiety can be assumed. Its clearest feature is the shift in viewpoint: you were above the terrain rather than trying to get through it.
Symbolic view
In symbolic traditions, flight has often meant leaving an ordinary viewpoint behind for a time. Mountains have been linked with effort and height; rivers with movement and the passing of time. Flying over both brings these images together: what is solid and what is flowing are visible in one scene. This is a way of reading the dream’s images, not a sign of what will happen next.